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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '733dd377cab90d7e34225a4121e48bee83235d2b2637657a85d730ee48ae554f' 
  AND token = 'K/phNCQkLh8Jt70moNkDjGFf4xQKH3iOUY97cATGP0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}